Is the information below correct for a UK STI??

"Tuned by Subaru Tecnica International Inc, up to 80 per cent of the STi’s all-alloy engine is new compared to the standard turbocharged 2.0 litre four-cam ‘boxer’ unit as fitted to the regular Impreza WRX. Engine strength and rigidity are boosted by using semi-closed-deck cylinder blocks, reshaping the piston head, fitting screw-in type connecting rods and using forged pistons and shimless valve lifters."

I was under the impression that the UK STI used those Hypereutetic pistons and that they were a bit of a weak point when it came to tuning??

I'm just thinking ahead for my 400bhp!!

 

I am sure someone will correct me if I am wrong, but I thought that it was 2.5l STi engines which used the Hypereutetic pistons.

 

and recent JDM 2.0 STi's